The fuel economy of a 2011 lexus rx 350 2wd 6 cylinder 35 l, Ask an Expert

Economics

The fuel economy of a 2011 Lexus RX 350 2WD 6 cylinder 3.5 L automatic 5−speed using premium fuel is a normally distributed random variable with a mean of μ = 20.5 MPG and a standard deviation of σ = 1.25 MPG.

(a) What is the standard error of X, the mean from a random sample of 16 fill−ups by one driver? (Round your answer to 4 decimal places.)

Standard error of X _____

(b) Within what interval would you expect the sample mean to fall, with 90 percent probability? (Round your answers to 4 decimal places.)

The interval is from ____ to _____

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Business Economics, Economics

Category:- Business Economics
Reference No.:- M91952141

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